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參數(shù)資料
| 型號(hào)： | MC68HC711D3CP3 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 125/138頁 |
| 文件大?。?/td> | 1047K |
| 代理商： | MC68HC711D3CP3 |
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Timer Structure
MC68HC711D3 Data Sheet, Rev. 2.1
Freescale Semiconductor
87
8.2 Timer Structure
Figure 8-2 shows the capture/compare system block diagram. The port A pin control block includes logic
for timer functions and for general-purpose input/output (I/O). For pins PA2, PA1, and PA0, this block
contains both the edge-detection logic and the control logic that enables the selection of which edge
triggers an input capture. The digital level on PA2–PA0 can be read at any time (read PORTA register),
even if the pin is being used for the input capture function. Pins PA6–PA4 are used for either
general-purpose output or as output compare pins. Pin PA3 can be used for general-purpose I/O, input
capture 4, output compare 5, or output compare 1. When one of these pins is being used for an output
compare function, it cannot be written directly as if it were a general-purpose output. Each of the output
compare functions (OC5–OC2) is related to one of the port A output pins. Output compare 1 (OC1) has
extra control logic, allowing it optional control of any combination of the PA7–PA3 pins. The PA7 pin can
be used as a general-purpose I/O pin, as an input to the pulse accumulator, or as an OC1 output pin.
8.3 Input Capture
The input capture function records the time an external event occurs by latching the value of the
free-running counter when a selected edge is detected at the associated timer input pin. Software can
store latched values and use them to compute the periodicity and duration of events. For example, by
storing the times of successive edges of an incoming signal, software can determine the period and pulse
width of a signal. To measure period, two successive edges of the same polarity are captured. To
measure pulse width, two alternate polarity edges are captured.
In most cases, input capture edges are asynchronous to the internal timer counter, which is clocked
relative to the PH2 clock. These asynchronous capture requests are synchronized to PH2 so that the
latching occurs on the opposite half cycle of PH2 from when the timer counter is being incremented. This
synchronization process introduces a delay from when the edge occurs to when the counter value is
detected. Because these delays offset each other when the time between two edges is being measured,
the delay can be ignored. When an input capture is being used with an output compare, there is a similar
delay between the actual compare point and when the output pin changes state.
Table 8-1. Timer Summary
Control
Bits
XTAL Frequencies
4.0 MHz
8.0 MHz
12.0 MHz
Other Rates
1.0 MHz
2.0 MHz
3.0 MHz
(E)
1000 ns
500 ns
333 ns
(1/E)
PR1 and PR0
Main Timer Count Rates
0 0
1 count —
overflow —
1.0 s
65.536 ms
500 ns
32.768 ms
333 ns
21.845 ms
(E/1)
(E/216)
0 1
1 count —
overflow —
4.0 s
262.14 ms
2.0 s
131.07 ms
1.333 s
87.381 ms
(E/4)
(E/218)
1 0
1 count —
overflow —
8.0 s
524.29 ms
4.0 s
262.14 ms
2.667 s
174.76 ms
(E/8)
(E/219)
1 1
1 count —
overflow —
16.0 s
1.049 s
8.0 s
524.29 ms
5.333 s
349.52 ms
(E/16)
(E/220)
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| MC68HC711D3VFNE2 | 功能描述:8位微控制器 -MCU 8B OTP 192RAM 2 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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